v1.6.0 on Windows 7 Pro 64-bit.
I've tried pressing the Clear button on the Preferences Synchronization tab and re-connecting with no success. The URL on this tab is https://one.ubuntu.com/notes/. Synchronization from Ubuntu 11.10 {Tomboy 1.8.0} works fine.
From the Windows machine's %LOCALAPPDATA%\Tomboy\tomboy.log:
05/07/2012 12:51:46 [ERROR]: Caught exception. Message: The remote server returned an error: (500) Internal Server Error.
05/07/2012 12:51:46 [ERROR]: Stack trace for previous exception: at System.Net.HttpWebRequest.GetResponse()
at Tomboy.WebSync.Api.OAuth.MakeWebRequest(RequestMethod method, String url, List`1 parameters, String postData) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 259
05/07/2012 12:51:46 [ERROR]: Rest of stack trace for above exception: at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Environment.get_StackTrace()
at Tomboy.WebSync.Api.OAuth.MakeWebRequest(RequestMethod method, String url, List`1 parameters, String postData) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 265
at Tomboy.WebSync.Api.OAuth.WebRequest(RequestMethod method, String url, String postData) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 212
at Tomboy.WebSync.Api.OAuth.Get(String uri, IDictionary`2 queryParameters) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 105
at Tomboy.WebSync.Api.UserInfo.GetUser(String userUri, IWebConnection connection) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\UserInfo.cs:line 38
at Tomboy.WebSync.WebSyncServer.BeginSyncTransaction() in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\WebSyncServer.cs:line 56
at Tomboy.Sync.SyncManager.SynchronizationThread() in c:\Users\grep\Development\tomboy\Tomboy\Synchronization\SyncManager.cs:line 408
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
05/07/2012 12:51:46 [ERROR]: Synchronization failed with the following exception: The remote server returned an error: (500) Internal Server Error.
at System.Net.HttpWebRequest.GetResponse()
at Tomboy.WebSync.Api.OAuth.MakeWebRequest(RequestMethod method, String url, List`1 parameters, String postData) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 266
at Tomboy.WebSync.Api.OAuth.WebRequest(RequestMethod method, String url, String postData) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 212
at Tomboy.WebSync.Api.OAuth.Get(String uri, IDictionary`2 queryParameters) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\OAuth.cs:line 105
at Tomboy.WebSync.Api.UserInfo.GetUser(String userUri, IWebConnection connection) in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\Api\UserInfo.cs:line 38
at Tomboy.WebSync.WebSyncServer.BeginSyncTransaction() in c:\Users\grep\Development\tomboy\Tomboy\Addins\WebSyncService\WebSyncServer.cs:line 56
at Tomboy.Sync.SyncManager.SynchronizationThread() in c:\Users\grep\Development\tomboy\Tomboy\Synchronization\SyncManager.cs:line 408
